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drm: document the all the atomic iterators

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Mostly because I want the links from the newly-added @state functions
to work. But I think explaining when they're useful and that the
implicit one is deprecated is good either way. Slightly repetitive
unfortunately.

Cc: Harry Wentland <harry.wentland@amd.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170328155349.5972-3-daniel.vetter@ffwll.ch
This commit is contained in:
Daniel Vetter 2017-03-28 17:53:49 +02:00
parent c9e42b72b4
commit f9a769555d
1 changed files with 158 additions and 1 deletions
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159
include/drm/drm_atomic.h
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@ -498,6 +498,23 @@ int __must_check drm_atomic_nonblocking_commit(struct drm_atomic_state *state);
void drm_state_dump(struct drm_device *dev, struct drm_printer *p);
/**
* for_each_connector_in_state - iterate over all connectors in an atomic update
* @__state: &struct drm_atomic_state pointer
* @connector: &struct drm_connector iteration cursor
* @connector_state: &struct drm_connector_state iteration cursor
* @__i: int iteration cursor, for macro-internal use
*
* This iterates over all connectors in an atomic update. Note that before the
* software state is committed (by calling drm_atomic_helper_swap_state(), this
* points to the new state, while afterwards it points to the old state. Due to
* this tricky confusion this macro is deprecated.
*
* FIXME:
*
* Replace all usage of this with one of the explicit iterators below and then
* remove this macro.
*/
#define for_each_connector_in_state(__state, connector, connector_state, __i) \
for ((__i) = 0; \
(__i) < (__state)->num_connector && \
@ -506,6 +523,20 @@ void drm_state_dump(struct drm_device *dev, struct drm_printer *p);
(__i)++) \
for_each_if (connector)
/**
* for_each_oldnew_connector_in_state - iterate over all connectors in an atomic update
* @__state: &struct drm_atomic_state pointer
* @connector: &struct drm_connector iteration cursor
* @old_connector_state: &struct drm_connector_state iteration cursor for the
* old state
* @new_connector_state: &struct drm_connector_state iteration cursor for the
* new state
* @__i: int iteration cursor, for macro-internal use
*
* This iterates over all connectors in an atomic update, tracking both old and
* new state. This is useful in places where the state delta needs to be
* considered, for example in atomic check functions.
*/
#define for_each_oldnew_connector_in_state(__state, connector, old_connector_state, new_connector_state, __i) \
for ((__i) = 0; \
(__i) < (__state)->num_connector && \
@ -515,6 +546,18 @@ void drm_state_dump(struct drm_device *dev, struct drm_printer *p);
(__i)++) \
for_each_if (connector)
/**
* for_each_old_connector_in_state - iterate over all connectors in an atomic update
* @__state: &struct drm_atomic_state pointer
* @connector: &struct drm_connector iteration cursor
* @old_connector_state: &struct drm_connector_state iteration cursor for the
* old state
* @__i: int iteration cursor, for macro-internal use
*
* This iterates over all connectors in an atomic update, tracking only the old
* state. This is useful in disable functions, where we need the old state the
* hardware is still in.
*/
#define for_each_old_connector_in_state(__state, connector, old_connector_state, __i) \
for ((__i) = 0; \
(__i) < (__state)->num_connector && \
@ -523,6 +566,18 @@ void drm_state_dump(struct drm_device *dev, struct drm_printer *p);
(__i)++) \
for_each_if (connector)
/**
* for_each_new_connector_in_state - iterate over all connectors in an atomic update
* @__state: &struct drm_atomic_state pointer
* @connector: &struct drm_connector iteration cursor
* @new_connector_state: &struct drm_connector_state iteration cursor for the
* new state
* @__i: int iteration cursor, for macro-internal use
*
* This iterates over all connectors in an atomic update, tracking only the new
* state. This is useful in enable functions, where we need the new state the
* hardware should be in when the atomic commit operation has completed.
*/
#define for_each_new_connector_in_state(__state, connector, new_connector_state, __i) \
for ((__i) = 0; \
(__i) < (__state)->num_connector && \
@ -531,6 +586,23 @@ void drm_state_dump(struct drm_device *dev, struct drm_printer *p);
(__i)++) \
for_each_if (connector)
/**
* for_each_crtc_in_state - iterate over all connectors in an atomic update
* @__state: &struct drm_atomic_state pointer
* @crtc: &struct drm_crtc iteration cursor
* @crtc_state: &struct drm_crtc_state iteration cursor
* @__i: int iteration cursor, for macro-internal use
*
* This iterates over all CRTCs in an atomic update. Note that before the
* software state is committed (by calling drm_atomic_helper_swap_state(), this
* points to the new state, while afterwards it points to the old state. Due to
* this tricky confusion this macro is deprecated.
*
* FIXME:
*
* Replace all usage of this with one of the explicit iterators below and then
* remove this macro.
*/
#define for_each_crtc_in_state(__state, crtc, crtc_state, __i) \
for ((__i) = 0; \
(__i) < (__state)->dev->mode_config.num_crtc && \
@ -539,6 +611,18 @@ void drm_state_dump(struct drm_device *dev, struct drm_printer *p);
(__i)++) \
for_each_if (crtc_state)
/**
* for_each_oldnew_crtc_in_state - iterate over all CRTCs in an atomic update
* @__state: &struct drm_atomic_state pointer
* @crtc: &struct drm_crtc iteration cursor
* @old_crtc_state: &struct drm_crtc_state iteration cursor for the old state
* @new_crtc_state: &struct drm_crtc_state iteration cursor for the new state
* @__i: int iteration cursor, for macro-internal use
*
* This iterates over all CRTCs in an atomic update, tracking both old and
* new state. This is useful in places where the state delta needs to be
* considered, for example in atomic check functions.
*/
#define for_each_oldnew_crtc_in_state(__state, crtc, old_crtc_state, new_crtc_state, __i) \
for ((__i) = 0; \
(__i) < (__state)->dev->mode_config.num_crtc && \
@ -548,6 +632,17 @@ void drm_state_dump(struct drm_device *dev, struct drm_printer *p);
(__i)++) \
for_each_if (crtc)
/**
* for_each_old_crtc_in_state - iterate over all CRTCs in an atomic update
* @__state: &struct drm_atomic_state pointer
* @crtc: &struct drm_crtc iteration cursor
* @old_crtc_state: &struct drm_crtc_state iteration cursor for the old state
* @__i: int iteration cursor, for macro-internal use
*
* This iterates over all CRTCs in an atomic update, tracking only the old
* state. This is useful in disable functions, where we need the old state the
* hardware is still in.
*/
#define for_each_old_crtc_in_state(__state, crtc, old_crtc_state, __i) \
for ((__i) = 0; \
(__i) < (__state)->dev->mode_config.num_crtc && \
@ -556,6 +651,17 @@ void drm_state_dump(struct drm_device *dev, struct drm_printer *p);
(__i)++) \
for_each_if (crtc)
/**
* for_each_new_crtc_in_state - iterate over all CRTCs in an atomic update
* @__state: &struct drm_atomic_state pointer
* @crtc: &struct drm_crtc iteration cursor
* @new_crtc_state: &struct drm_crtc_state iteration cursor for the new state
* @__i: int iteration cursor, for macro-internal use
*
* This iterates over all CRTCs in an atomic update, tracking only the new
* state. This is useful in enable functions, where we need the new state the
* hardware should be in when the atomic commit operation has completed.
*/
#define for_each_new_crtc_in_state(__state, crtc, new_crtc_state, __i) \
for ((__i) = 0; \
(__i) < (__state)->dev->mode_config.num_crtc && \
@ -564,6 +670,23 @@ void drm_state_dump(struct drm_device *dev, struct drm_printer *p);
(__i)++) \
for_each_if (crtc)
/**
* for_each_plane_in_state - iterate over all planes in an atomic update
* @__state: &struct drm_atomic_state pointer
* @plane: &struct drm_plane iteration cursor
* @plane_state: &struct drm_plane_state iteration cursor
* @__i: int iteration cursor, for macro-internal use
*
* This iterates over all planes in an atomic update. Note that before the
* software state is committed (by calling drm_atomic_helper_swap_state(), this
* points to the new state, while afterwards it points to the old state. Due to
* this tricky confusion this macro is deprecated.
*
* FIXME:
*
* Replace all usage of this with one of the explicit iterators below and then
* remove this macro.
*/
#define for_each_plane_in_state(__state, plane, plane_state, __i) \
for ((__i) = 0; \
(__i) < (__state)->dev->mode_config.num_total_plane && \
@ -572,6 +695,18 @@ void drm_state_dump(struct drm_device *dev, struct drm_printer *p);
(__i)++) \
for_each_if (plane_state)
/**
* for_each_oldnew_plane_in_state - iterate over all planes in an atomic update
* @__state: &struct drm_atomic_state pointer
* @plane: &struct drm_plane iteration cursor
* @old_plane_state: &struct drm_plane_state iteration cursor for the old state
* @new_plane_state: &struct drm_plane_state iteration cursor for the new state
* @__i: int iteration cursor, for macro-internal use
*
* This iterates over all planes in an atomic update, tracking both old and
* new state. This is useful in places where the state delta needs to be
* considered, for example in atomic check functions.
*/
#define for_each_oldnew_plane_in_state(__state, plane, old_plane_state, new_plane_state, __i) \
for ((__i) = 0; \
(__i) < (__state)->dev->mode_config.num_total_plane && \
@ -581,6 +716,17 @@ void drm_state_dump(struct drm_device *dev, struct drm_printer *p);
(__i)++) \
for_each_if (plane)
/**
* for_each_old_plane_in_state - iterate over all planes in an atomic update
* @__state: &struct drm_atomic_state pointer
* @plane: &struct drm_plane iteration cursor
* @old_plane_state: &struct drm_plane_state iteration cursor for the old state
* @__i: int iteration cursor, for macro-internal use
*
* This iterates over all planes in an atomic update, tracking only the old
* state. This is useful in disable functions, where we need the old state the
* hardware is still in.
*/
#define for_each_old_plane_in_state(__state, plane, old_plane_state, __i) \
for ((__i) = 0; \
(__i) < (__state)->dev->mode_config.num_total_plane && \
@ -589,6 +735,17 @@ void drm_state_dump(struct drm_device *dev, struct drm_printer *p);
(__i)++) \
for_each_if (plane)
/**
* for_each_new_plane_in_state - iterate over all planes in an atomic update
* @__state: &struct drm_atomic_state pointer
* @plane: &struct drm_plane iteration cursor
* @new_plane_state: &struct drm_plane_state iteration cursor for the new state
* @__i: int iteration cursor, for macro-internal use
*
* This iterates over all planes in an atomic update, tracking only the new
* state. This is useful in enable functions, where we need the new state the
* hardware should be in when the atomic commit operation has completed.
*/
#define for_each_new_plane_in_state(__state, plane, new_plane_state, __i) \
for ((__i) = 0; \
(__i) < (__state)->dev->mode_config.num_total_plane && \
@ -603,7 +760,7 @@ void drm_state_dump(struct drm_device *dev, struct drm_printer *p);
*
* To give drivers flexibility &struct drm_crtc_state has 3 booleans to track
* whether the state CRTC changed enough to need a full modeset cycle:
* connectors_changed, mode_changed and active_changed. This helper simply
* planes_changed, mode_changed and active_changed. This helper simply
* combines these three to compute the overall need for a modeset for @state.
*
* The atomic helper code sets these booleans, but drivers can and should